Administratrix of the



iluitrntatrs ateat @ffice EMILY S. GRIFFET., OFST. LOUIS, MISSOURI,ADMINISTRAIRIX OF THE ESTATE OF JOSEPH A. G REFFE'I, DEGEASED.

Letters .Patent No. 72,194, fZatacZ'Det-ember 17, 1867.

IMPROVEMENT IN REEIOVENS FOR BAKER-S.

TO ALLWHOM IT MAY CONCERN;

Be it known that JOSZEPH A. GREFFET, deceased, late ci tho city andcounty of St. Louis, State of Missouri,

did in his lifetime invent a new and useful Improved Oven, of which thefollowing is a full, clear, and exact description, reference being hadtothe annexed drawings, making a part of this specification, in which-Figure 1, plate 1, represents 'a front view of said oven.

Figure 2 represents avlongitudinal sectional elevation of same.

Figure 1, plate 2, represents a rear elevation of said oven.

Figure 2 represents a side elevation of same.

Similar letters indicate like parte'.

This invention is designed to produce an oven more particularly adaptedto the baking of crackers on a large scale.

The oven A is built in the ordinary manner, lined with tire-brick, itssides arching and forming a dome, and having two furnaces, a a, iig. 1,plate 1, beneath, with arched roofs extending nearly the whole length oftheoven, but having a considerable space between them. From the back endof each extends a ue, one passing out of the rear of the oven at b, andone at b', fig. l, plate 2, and both'connccting with the iue c openinginto the chimney D, built in the corner ofthe oven. Two damper-s, e a',fig. 1, plate 2, attached topthe rods ff', fig. l, plates 1 and 2, serveto regulate the draught of the lues b b. In thc centre of the oven, andbetween the furnaces, is an opening, g, from which a ilue, h, iig. 2,plate 1, extends to the l'car of the oven, and there connects by anelbow, k, with the ilue c, iig. 1, plate 2. By this the oven isfreedfrom the ashes that are apt to accumulate, and its operations arecontrolled by the damper m, connected with the rod n, figs. land 2,plate l1, and fig. 2, plate 2. On either side of the oven are twoopenings, of which two are seen at 0.o, fig. 2, plate 2, connecting withfour fines, two ofwhich -are shown atp p. These four lues connect withthe due c, two of them at g, figs. 1 and2, plate 2, andthe other twowith the same flue, ou the other side ofthe oven inthe rear of thechimney D. Four dempers control these ilues, two of them being shown atr r', fig. 2, plate 2, and to the dampers are attached four rods s s ss, fig. 1, and s 3', iig. 2, plate 2, and s' s",iig. 2, plate 1, bymeans of which they are operated.- All these rods pass through guidingstraps as at e z', figs. 1 and 2, plate 2. A. sheet-iron drum, T, iig.2, plate 1, supported upon a shaft having its bearings in the sides ofthe oven, is made to revolve in the oven by. means of a belt passingaround the driving-pulley v, figs. l and 2, plate 2, on the outside ofthe oven. From each end of the drum extend radial arms1 2 3 4: 5 6 7 8 910711 12, to which are attached pans, 'w 'w1 'w2 wg w4 105 wr co7 'w8'wg wl" w, swinging freely upon pivots in such a manner that when thedrum revolves, they will retain their horizontal position. lhe drum andthe pans extend from-:one side of the oven to the other, just spaceenough being left at either end to allow the same to revolve. A There isa door, fr, figs. 1 and 2, plate 1, in the face of the oven, by means ofwhich the crackers are placed on the pans from the peel and removedtherefrom. The tires having been started, when the civen is sufiicientlyhot, the drum heilig made to revolve in the direction indicated by thearrow, the pans, a's they come in succession before the door aresupplied with the articles to bo baked, and relieved of them as they aredonc. When it is desired to cool the oven for the purpose, for instance,of baking crackers requiring a less degree of heat', the dampers r i"shown in the drawing, and the corresponding ones on the opposite side ofthe oven, not shown, are opened, and the draught of the chimney sooncarries oif the surplus heat. When the oven is sufficiently cooled, thedempers are closed and the pns filled as before.

'.lhe pecuiiarity of this invention consists in attaching the pans to adrum instead of a frame, as has been the method heretofore followed. Theadvantage of this is in the more equal distribution of the heatthroughout the oven, by the radiation from the drum, and in keeping aheated surface continually in contact with the pans. Anothergrcatadvantage is the perfect control the operator has over the temperatureof the oven, by means of the fines p p p 19', by which the heat can bealmost instantaneously reduced to the desired intensity-a very desirablething in baking different kinds of crackers, requiring, as they do,various degrees of heat. 'lhe fines p p alone are shown in the drawing',but pp are on the opposite side of the oven in the same relativepositien, and of exactly the same construction as p'p.

It is not claimed that the deceased w oven, nor of the use of theash-Hue; but

What is claimed as the invention of the de 1; The combination of a drumwit-h the r stentially as shown and specified.

2. The arrangement ef the regulating-{1m32} pjWp" Qperating-rods, whencenstrueted and arranged substantially as the first inventor of thearrangement of' the revolving pans in an ceased, and for which LettersPatent are desired, isevoiving pens of an oven, when constructed andarrange subof :tu oven, with their respective damper-s and as shown mndspecified.l

EMILY S. GREFFET,

Admz'm'sfrarz'z. 'Witnessesz l Y SAML. S. BOYD; HENRY T. CARTER.

